<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>加加减减</title>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="(item,index) in list" :key="item.id">{{item.num}}<button @click="dj(item.id)">删除</button></li>
        </ul>
        <button @click="ss()">生成</button>
    </div>
</body>
<script src="./vue.js"></script>
<script>
    const app = new Vue({
        el: '#app',
        data: {
            list: [
                { id: 1, num: 1 },
                { id: 2, num: 5 },
                { id: 3, num: 3 }
            ],

        },
        methods: {

            dj(id) {
                this.list = this.list.filter(a => a.id != id)
            },
            ss() {
                this.list.push({
                    id: Date.now(),
                    num: Math.floor(Math.random() * 20) + 1
                })
            }
        },

    })
</script>

</html>